Why younger players are cramping in Melbourne

If you have been watching the AO this year, you probably saw the cramping amongst the younger elite men. The heat has been brutal, and after 2.5 hours, some of these guys have been close to full-body cramps. Here is my take on this, and I welcome discussion.

 Most people assume the player is dehydrated. That they should have had more water. But the science tells a different story.

It is not a hydration problem. It is a neurological one.

Your muscles do not just contract on their own. A signal from your nervous system drives every contraction. And every contraction has a built-in safety check. Sensors in the muscle, called muscle spindles, drive contraction, while sensors in the tendon, called Golgi tendon organs, put the brakes on. That balance between "go" and "stop" is what keeps your muscles working smoothly (Schwellnus et al., 1997).

 When a muscle becomes fatigued and overloaded, that balance breaks down. The excitatory signal gets louder. The inhibitory signal gets quieter. The muscle contracts involuntarily. That is a cramp (Miller et al., 2022).

This is why cramps almost always happen late in matches, in the muscles doing the most work. It is a fatigue event, not a fluid event. 

Younger players ask more of their muscles, neurologically.

The modern young player's game is built on explosive movement. Violent acceleration, hard braking, rapid change of direction, repeated at high intensity for hours. Every one of those actions requires a massive neurological output. The central nervous system has to fire fast, coordinate precisely, and sustain that level of drive across an entire match.

That is an enormous demand 

Prolonged high-intensity effort does not just fatigue the muscles locally. It fatigues the central nervous system itself. This is called central fatigue, and it refers to a reduced ability of the brain and spinal cord to maintain the neural drive needed to keep muscles firing properly (Davis and Bailey, 1997; Taylor and Gandevia, 2008). Neurotransmitter changes, particularly involving serotonin and dopamine, play a role. So does the accumulation of metabolic byproducts, such as ammonia, which cross the blood-brain barrier and affect brain function (Tornero-Aguilera et al., 2022).

When central fatigue sets in, motor control gets sloppy. Muscle regulation becomes less precise. And the conditions for cramping become ideal.

Potentially, a veteran player avoids much of this. Not because they are fitter, necessarily, but because they have learned to manage neurological load. They pace their effort. They move efficiently, with less wasted output. Their between-point routines are deliberate. Their fuelling and sodium strategies have been refined over the years.

 Same court. Same heat. But a very different demand on the nervous system.

 Water alone can make it worse

This is worth knowing at the club level, too.

 Drinking large amounts of plain water during prolonged exercise can dilute blood sodium, a condition called exercise-associated hyponatraemia. The primary cause is overhydration relative to sodium intake (Hew-Butler et al., 2017). In severe cases, it can cause confusion, seizures, and worse.

The answer is not to drink more. It is to drink smarter. Fluid combined with sodium and carbohydrate, matched to your sweat rate and the conditions. 

What this means for you

 Cramping is a sign that the nervous system has been pushed past its ability to regulate muscle contraction. Heat makes it worse. Intensity makes it worse. And poor fuelling leaves you exposed.

 If you are playing long matches in the heat, the biggest thing you can do is not do heroic fitness work. It is learning to manage your output, fuel properly, and give your nervous system a chance to stay in control.

If I was going to recommend a neurologoclally focussed supplement is would be : iüLabs Vitalizer https://www.iulabs.co.uk/products/vitalizer-energy-boost-supplement

That is the real lesson from Melbourne.

References

Davis, J.M. and Bailey, S.P. (1997). Possible mechanisms of central nervous system fatigue during exercise. Medicine and Science in Sports and Exercise, 29(1), 45-57.

Hew-Butler, T. et al. (2017). Exercise-associated hyponatremia: 2017 update. Frontiers in Medicine, 4, 21.

Miller, K.C. et al. (2022). An evidence-based review of the pathophysiology, treatment, and prevention of exercise-associated muscle cramps. Journal of Athletic Training, 57(1), 5-15.

Schwellnus, M.P., Derman, E.W. and Noakes, T.D. (1997). Aetiology of skeletal muscle cramps during exercise: a novel hypothesis. Journal of Sports Sciences, 15(3), 277-285.

Taylor, J.L. and Gandevia, S.C. (2008). A comparison of central aspects of fatigue in submaximal and maximal voluntary contractions. Journal of Applied Physiology, 104(2), 542-550.

Tornero-Aguilera, J.F. et al. (2022). Central and peripheral fatigue in physical exercise explained: a narrative review. International Journal of Environmental Research and Public Health, 19(7), 3909.

Troyer, W., Render, A. and Jayanthi, N. (2020). Exercise-associated muscle cramps in the tennis player. Current Reviews in Musculoskeletal Medicine, 13, 612-621.